Patents by Inventor J. Martin Carlson

J. Martin Carlson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Article of footwear for more efficient running
    Patent number: 5586398
    Abstract: An article of footwear (10) having an initial contact portion (30) and a medial/forefoot portion (34). The initial contact portion (30) exterior sole surface is formed at a dihedral angle (38) to the sole surface of the medial/forefoot portion (34) such that the heel portion has a minimal thickness of material interposed between the foot (32) and the ground surface (40) at a postero-lateral edge of the sole structure, which means that foot flight continues until the foot moves closer to the ground (40) to delay impact and increase stride length. A high friction interface (72,172) is provided in a medial/forefoot portion of a shoe insole and low friction interface (74,174) is provided at the initial contact portion (30) of the shoe insole. The low friction area (72) reduces shearing on foot impact, and the high friction forefoot interface (72,172) eliminates sliding of the forefoot during foot push-off, to decrease wasted energy. Energy efficient and stride length increase are achieved.
    Type: Grant
    Filed: October 13, 1995
    Date of Patent: December 24, 1996
    Inventor: J. Martin Carlson
  • Orthotic ankle flexure
    Patent number: D385358
    Type: Grant
    Filed: March 21, 1995
    Date of Patent: October 21, 1997
    Assignee: Tamarack Habilitation Technologies, Inc.
    Inventor: J. Martin Carlson